JP2022150545A - ハイブリッド車両の制御方法及び制御システム - Google Patents
ハイブリッド車両の制御方法及び制御システム Download PDFInfo
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- JP2022150545A JP2022150545A JP2021053190A JP2021053190A JP2022150545A JP 2022150545 A JP2022150545 A JP 2022150545A JP 2021053190 A JP2021053190 A JP 2021053190A JP 2021053190 A JP2021053190 A JP 2021053190A JP 2022150545 A JP2022150545 A JP 2022150545A
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- hydraulic pressure
- engine
- engagement element
- hybrid vehicle
- clutch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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Abstract
Description
このように構成された本発明によれば、エンジンの始動要求が発せられた直後に、摩擦締結要素へ迅速に作動油を供給することができ、その後の制御における摩擦締結要素の応答性を高めることができる。
このように構成された本発明によれば、摩擦締結要素の応答性を更に高めることができる。
このように構成された本発明では、例えば他のデバイスの準備ができるまでエンジンの始動を待機する必要があるときに、モータとエンジンとの間のトルク伝達を遮断しつつ、他のデバイスの準備が完了次第迅速に摩擦締結要素を接続してエンジンの始動を開始することができるようになる。
あるいは、本発明において、摩擦締結要素はノーマルクローズ型のクラッチであり、指示油圧は、第3の油圧、第2の油圧、第1の油圧の順に低い。
このように構成された本発明によっても、エンジン始動の応答性を確保しつつ、車両ショックを抑制することができる。
図1は、本発明の実施形態によるハイブリッド車両の制御方法及び制御システムが適用されるハイブリッド車両の概略構成図である。
なお、第2クラッチCL2は、実際には、変速機6において種々のギヤ段を切り替えるために用いられる多数のクラッチによって構成される。また、図1では単純化のためプラネタリギヤセットを1つだけ示しているが、実際には変速機6は複数のプラネタリギヤセットを備えている。第2クラッチCL2により代表される複数のクラッチや図示しない複数のブレーキ等の摩擦締結要素を選択的に締結して、各プラネタリギヤセットを経由する動力伝達経路を切り換えることにより、例えば複数の前進変速段と1段の後退速段とを実現可能となっている。
次に、本実施形態においてコントローラ20が行う制御内容について説明する。本実施形態では、コントローラ20は、エンジン2を停止した状態での走行中に、このエンジン2の始動要求が発せられたときに、エンジン2とモータ4との間に設けられた第1クラッチCL1を解放状態から所定のスリップ状態又は締結状態へと移行させるように、油圧制御回路14によって第1クラッチCL1に付与する油圧を制御する。こうすることで、第1クラッチCL1を介してモータ4のトルクをエンジン2に伝達して、モータ4によってエンジン2をクランキングすることでエンジン2を始動させるようにする。また、コントローラ20は、このようなエンジン2の始動時に、モータ4と車輪12との間に設けられた第2クラッチCL2を締結状態から所定のスリップ状態へと移行させる。こうすることで、動力源(特にエンジン2)と車輪12との間の第2クラッチCL2を介したトルク伝達をできるだけ低減させて、このトルク伝達によりハイブリッド車両1に発生するショック(車両ショック)を抑制するようにする。例えば、車両ショックには、走行しているハイブリッド車両1の運動エネルギーがエンジン2側に伝達されてエンジン始動に用いられることによる車両の減速がある。
次に、本発明の実施形態によるハイブリッド車両の制御方法及び制御システムの作用及び効果について説明する。
2 エンジン
4 モータ
5 バッテリ
6 変速機
8 動力伝達系
12 車輪
14 油圧制御回路
20 コントローラ(制御装置)
CL1 第1クラッチ(摩擦締結要素)
CL2 第2クラッチ
Claims (7)
- エンジンと、モータと、前記エンジンと前記モータとの間に油圧により断続可能に設けられた摩擦締結要素と、前記摩擦締結要素に付与する油圧を制御する油圧制御回路と、有するハイブリッド車両の制御方法であって、
前記ハイブリッド車両の走行中において停止している前記エンジンの始動要求が発せられたときに、前記摩擦締結要素を解放状態から所定のスリップ状態又は締結状態へ移行させるように、前記摩擦締結要素に付与する油圧を制御する工程と、
前記摩擦締結要素に付与する油圧の制御中及び/又は制御後に、前記モータのクランキングによって前記エンジンを始動させるように、前記モータ及び前記エンジンを制御する工程と、を有し、
前記摩擦締結要素に付与する油圧を制御する工程は、
前記ハイブリッド車両の目標駆動力が所定値未満の場合に、前記油圧制御回路への指示油圧を、前記摩擦締結要素が接続を開始したときの締結圧の上昇速度が所定値以下となる第1の油圧に設定して所定時間保持し、その後、前記指示油圧を、前記エンジンの始動に必要なトルクを伝達するためのエンジン始動締結圧を前記摩擦締結要素に発生させる第2の油圧に設定して当該エンジンの始動が完了するまで保持し、その後、前記指示油圧を、前記摩擦締結要素を締結状態にするための第3の油圧に設定する工程と、
前記ハイブリッド車両の目標駆動力が所定値以上の場合に、前記指示油圧を、前記第1の油圧に設定することなく前記第2の油圧に設定して当該エンジンの始動が完了するまで保持し、その後、前記指示油圧を前記第3の油圧に設定する工程と、を含む、
ことを特徴とするハイブリッド車両の制御方法。 - 前記摩擦締結要素に付与する油圧を制御する工程は、前記エンジンの始動要求が発せられたときに、最初に、前記指示油圧を、前記エンジン始動締結圧より高い締結圧を前記摩擦締結要素に発生させることが可能な第4の油圧に設定して所定時間保持する工程を更に含む、請求項1に記載のハイブリッド車両の制御方法。
- 前記目標駆動力が所定値以上の場合に前記指示油圧を前記第4の油圧に保持する時間は、前記目標駆動力が所定値未満の場合に前記指示油圧を前記第4の油圧に保持する時間よりも長い、請求項2に記載のハイブリッド車両の制御方法。
- 前記摩擦締結要素に付与する油圧を制御する工程は、前記ハイブリッド車両の目標駆動力が所定値未満の場合に、前記指示油圧を前記第1の油圧に設定して所定時間保持した後、前記第2の油圧に設定する前に、前記指示油圧を、前記摩擦締結要素を接続直前の状態で待機させる第5の油圧に設定して所定条件が満たされるまで保持する、請求項1乃至3の何れか一項に記載のハイブリッド車両の制御方法。
- 前記摩擦締結要素はノーマルオープン型のクラッチであり、前記指示油圧は、前記第3の油圧、前記第2の油圧、前記第1の油圧の順に高い、請求項1乃至4の何れか一項に記載のハイブリッド車両の制御方法。
- 前記摩擦締結要素はノーマルクローズ型のクラッチであり、前記指示油圧は、前記第3の油圧、前記第2の油圧、前記第1の油圧の順に低い、請求項1乃至4の何れか一項に記載のハイブリッド車両の制御方法。
- ハイブリッド車両の制御システムであって、
エンジン及びモータと、
前記エンジンと前記モータとの間に油圧により断続可能に設けられた摩擦締結要素と、 前記摩擦締結要素に付与する油圧を制御する油圧制御回路と、
前記エンジン、前記モータ、前記摩擦締結要素及び前記油圧制御回路を制御するよう構成された制御装置と、を有し、
前記制御装置は、
前記ハイブリッド車両の走行中において停止している前記エンジンの始動要求が発せられたときに、前記摩擦締結要素を解放状態から所定のスリップ状態又は締結状態へ移行させるように、前記摩擦締結要素に付与する油圧を制御し、
前記摩擦締結要素に付与する油圧の制御中及び/又は制御後に、前記モータのクランキングによって前記エンジンを始動させるように、前記モータ及び前記エンジンを制御するように構成され、
前記制御装置は、前記摩擦締結要素に付与する油圧を制御するときに、
前記ハイブリッド車両の目標駆動力が所定値未満の場合に、前記油圧制御回路への指示油圧を、前記摩擦締結要素が接続を開始したときの締結圧の上昇速度が所定値以下となる第1の油圧に設定して所定時間保持し、その後、前記指示油圧を、前記エンジンの始動に必要なトルクを伝達するためのエンジン始動締結圧を前記摩擦締結要素に発生させる第2の油圧に設定して当該エンジンの始動が完了するまで保持し、その後、前記指示油圧を、前記摩擦締結要素を締結状態にするための第3の油圧に設定し、
前記ハイブリッド車両の目標駆動力が所定値以上の場合に、前記指示油圧を、前記第1の油圧に設定することなく前記第2の油圧に設定して当該エンジンの始動が完了するまで保持し、その後、前記指示油圧を前記第3の油圧に設定するように構成される、
ことを特徴とするハイブリッド車両の制御システム。
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